Question about Kia Sportage

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99 kia sportage, backfiring, no power, rough idle.

I have a 99 kia sportage, which is backfiring, and lost all power, and has horrible idle. A few weeks back it overheated, and leaked out nearly ALL the coolant from the system (separate issue obviously). I filled the coolant tank again, and was fine. Shortly after, I decided to put in a fuel injector cleaner, as it had a TAD rough idle, but full power and no backfiring. Within an hour of putting the treatment in, the car was in BAD shape. It literally has NO power at all now, revs extremely high trying to climb tiny hills, and backfires about every 1-2 seconds, at low and high acceleration. I was originally thinking bad fuel filter, as all the gunk from the injectors might have plugged it. Replaced it, which made it run 10% better for a day, but didn't fix the issue. I grabbed a set of plugs, as I thought possibly the overheat might have fouled a plug or 2, but haven't yet swapped them out. I know vacuum leaks are the main cause of these sort of issues, and I also noticed a bit of fluid leaking from the head, and a bit of coolant smell through the vents occasionally. At idle it doesn't backfire much, or at all, just under any kind of load. From the info I can gather, most folks seem to think a head gasket leak wouldn't be substantial enough to cause all these issues, even if it WERE on the way out, but thought I'd get some more opinions. Also, the backfiring seems to be coming from the front of the vehicle, as I can physically feel it under my feet while driving - and it's LOUD as hell! Plugs? Head gasket? Sensor? Exhaust manifold leak? Any help would be appreciated - thanks!

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Yes it is a blown head gasket also probally a broken valve these engines do not like heat do your self a favor and stop driving it your doing more damage to it everytime you start it

Posted on Apr 22, 2013


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Posted on Jan 02, 2017

  • 431 Answers

SOURCE: backfire problem and bad smell smoke

i would check the timing as this will cause it to backfire

Posted on Feb 17, 2012

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SOURCE: misfiring when accelerating at highway speeds in fifth gear

It could be a couple of things.
1) Check to make sure the wires are in the correct firing order.
2) Check to make sure th plugs are still good, including the gap.
If these don't work than you should probably have a mechanic look at it in person.

Posted on Feb 13, 2009

  • 61 Answers

SOURCE: 1992 Lumina Backfire - I

I know you mentioned the EGR valve has been replaced, but you may have a bad 'new' part. I know the car is electronic, but has anyone checked its ignition timing (timing belt been looked at, I know it only has 77k on it). Is the fuel pressure regulator OK and it vacumm supply?

Posted on Nov 15, 2010

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